2. Preventative Maintenance (PMCS) of Tactical
vehicles (HMMVEE)
Standard – Soldiers will learn how to properly
PMCS any HMVWEE Vehicle with no supervision
before any operations involving any HMMVEE
Condition – Class room settings with power
point presentation and lecture.
3. Preventative Maintenance (PMCS) of Tactical
vehicle (HMMVEE)
PMCS
(Preventative Maintenance Check and Services)
- Thorough inspection of any tactical vehicle prior and
after operating any tactical vehicles.
- Failure to conduct PMCS of vehicles can lead to dire
consequences.
4. 1.) Leaks
HUMVEE
1.) Leaks
- Check both front and side exterior for any leaks. Any
leaks detected must be further investigated before
further continuation of PMCS. Check underneath for
any evidence as well.
6. Types of leaks
The amount of leakage is designated by three
categories of leaks.
Class 1 – Leakage indicated by wetness or discoloration,
not great enough to form drops.
Class 2 – Leakage great enough to form drops, but not
enough to cause drip from item being
checked/inspected.
Class 3 – Leakage great enough to form drops that fall
from the item being checked/inspected
7. CAUTION
Operating the HUMVEE is allowable only with
class 1 or 2 leakage except for the brake system.
However, more frequent checks must be made!
WHEN IN DOUT, NOTIFY YOUR SUPERVISOR
8. 2.) Tires
• Check tires for any underinflated (less than
the recommended tire pressure).
9. 2) Tires
It will during tire inspections that any brake fluid
leaks will be visible. Always check underneath
the tire and behind it (under the vehicle).
10. 2.) Tires
If tires are under inflated or in any condition
needs to be replaced, consult with your frontline
supervisor.
11. 2.) Tires
Check tire thread depth. Tread should not be
worn beyond level of wear bar (1/16 in)
12. 2.) Tires
Check for missing or loose wheel stud nuts and
lug nuts. Tighten loose lug nuts and have unit
maintenance tighten stud nuts to proper torque.
Purpose of this presentation is to break down PMCSing the HMMWV into “barney style” for all observers of this presentation.
As the operator seeks any sign of leaking from wherever it comes from, it is vital that the operator investigates any discovery of leakage and informs maintenance and does not tighten anything or does anything to the vehicle.
Operating the HMMWV under Class 1 or Class 2 is possible. But this will be done by the voluntary risk of the operator. Frequent checking of the leakage periodically is important. Will likely require the operator to add more of whatever fluid is leaking.
If tires are underinflated, the tactical vehicle is not fully mission capable.
Power steering fluid should be between “HOT” and “COLD” marks. Add fluid if level is below “COLD” mark.
Like checking the power steering reservoir, if the fluid checked is at the “ADD” level, be sure to refill on Transmission fluid. Failure of tranny check will cause damage to the Transmission system. Same with the Engine Oil for the HMMVEE
Overall, Check for leaks/cracks from hoses, cracks on the radiator, and any coersion from the engine. Any concerns should be brought up with immediate frontline supervisor.
Some HMMWV instrument panels will be modernized and use push in buttons instead of switches. Be sure to check the instrument panels on your HMMWV.
This is used to turn both N.V lights and conventional lights on and off the HMMWV. Check the switches alongside the lights to check if they both are operational. Move top switch to the right at the same time with the bottom right switch up. This turns on the front head lights of the tactical vehicle.
This is what causes the vehicle’s engine to turn over. First, Put the ignition on the “run” option. There will be a “WAIT” light that will turn on and turn itself off. Once, the wait light if off, turn the switch over to “START” once and the engine will roll over.
Upon turning over the engine after checking the workings of the ignition system, the Soldier will check the oil pressure gauge. The Pressure should be center around 60. If oil is less or over 60, consult with frontline supervisor.
If the needle is within the ranges of the color red or yellow consistently, consult with frontline supervisor.
While the Engine still on, if the engine temp exceeds 225 and there is already enough coolant in the engine, consult with your frontline supervisor.
This instrument indicates any restrictions in the air cleaner system in the HMMWV. If the yellow meter is in the red zone, consult with your immediate frontline supervisor.
In addition to checking the front lights while checking the operations of the M 38 light switches, apply gentle pressure on the brakes and have someone inspect the operations of the rear lights. A pair of bright red lights will beam out.
With a ground guide behind the HMMWV, the operator will lift and lower the turn signal lever to activate the left and right turn signal rear light. If either light signals do not activate upon operating the lever, then the HMMWV is a no go. And the same goes for the emergency signals.
HMMWV will always have a pair of Chalk blocks, two sets of fire Extinguishers, and at least one drip pan.
